Whilst few versions back you would have to first export CDL as EPS or AI and import that to CorelDraw in order to save it as CDR, the latest version of SignLab offers direct plugins with CorelDraw which makes import and exporting of CorelDraw format (*.cdr) much more easier.
Convert SignLab vector graphics to CorelDRAW vector or bitmap graphics.
We found one software available in the database for this conversion.
Microsoft Windows software - convert cdl to cdr on Windows
A professional software for signmakers
Convert from cdl file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.